The sale is a contract governed by art. from 1470 until 1509 of the civil code. The c.c. he simply calls it sale, while it is translated into Latin as emptiovenditio. Ex art. 1470 of the civil code Sale is the contract which has as its object the transfer of ownership of a thing or the transfer of another right in exchange for a price.
Two parties can be identified: the seller (alienator) who transfers the right and the buyer or acquirer (alienator), who undertakes to pay a price, expressed in a sum of money, as consideration.
For real estate, the sale can be by size or by lump sum, depending respectively on whether or not the contract refers to the superficial extension of the property for determining the price.